External battery for Garmin Edge

You can use any USB external battery and a USB "on the go" charging cable.  I believe the "on the go" cable is missing a pin that allows the garmin to be plugged in, but not recognize it is a peripheral device...thus it can still operate as normal while being charged.  When you plug your Garmin into a normal cable that has all the pins, the Garmin goes into peripheral mode (as if your computer is connecting to it) and can no longer record anymore because it may be requested by the PC to download or delete files on it.

At least that is my understanding of it.  You can google for more info...there are many people who have done exactly what you are trying to do.

Thanks Jason - just what I was after ... especially the tip for the OTG cable.

Dorm

Yes you want a charging cable not a data cable. And that is a good choice for battery. Anker makes great products I have several.

OK. So I've been able to continue using my Edge 810 (it was tracking/recording my progress) whilst plugged into a USB battery and I used the cable that came with my device. I'm pretty sure that isnt an 'on the go' USB cable?

Didn't think to ask but should a Garmin Edge 500 last for 10 hrs given that it's fully charged?  Data taken would be the typical GPS, HR, POWER, speed, elevation et al.

Thanks - Dorm